Re: sysenter on x86

From: Arjan van de Ven (arjanv@redhat.com)
Date: Sat Apr 12 2003 - 09:15:27 EST

On Sat, 2003-04-12 at 15:54, Felix von Leitner wrote:
> I just added sysenter support for linux-2.5 on x86 to the diet libc, but
> I noted that the original patch said user space should jump to
> 0xfffff000, which segfaults. Jumping to 0xffffe000 works.
>
> I suggest adding a comment somewhere in the kernel about the proper
> calling convention, because the glibc code is frankly not readable in
> this regard.

you HAVE to use the location as specified with the AT_SYSINFO elf flag.
The kernel is free to move this address around between builds, as long
as AT_SYSINFO gives the address for the location.


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